The radioactivity of uranium is low, and so no particularly high standards of radioprotection are needed: as can be seen with the above workmen. The concentrated uranium they are handling, also known as ‘Yellow Cake’, takes the form of a bright yellow powder containing about 750kg of uranium per tonne. This high concentration makes it much easier to transport the uranium from the mine to the factory. The photograph above shows the ‘yellow cake’ on a filter at a treatment plant in Jouac (Haute-Vienne) at Limousin, France.